Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters
A vulnerability has been identified within Rancher Manager where the Fleet agent wrote resources to downstream clusters using its own cluster-admin credentials instead of the ServiceAccount pinned to the deployment. It affects multi-tenancy environments where different tenants share the same downstream clusters, for example different privileged or untrusted teams inside the same organization. This could lead to overwritten configuration files. This issue affected SUSE Rancher Fleet 0.16 before 0.16.2, 0.15 before 0.15.7, and 0.14 before 0.14.11.
CVE-2026-88808
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-88808
Rancher
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/rancher/fleet/",
"vendor": "SUSE",
"product": "Rancher",
"versions": [
{
"status": "affected",
"version": "0.16.0",
"lessThan": "0.16.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "0.15.0",
"lessThan": "0.15.7",
"versionType": "semver"
},
{
"status": "affected",
"version": "0.14.0",
"lessThan": "0.14.11",
"versionType": "semver"
}
],
"packageName": "Fleet",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-88808
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #3413 · Revision 1
- Added to Heist Feed
- Publisher date